Fixes spelling error in test name

Changes 'attribtues' to 'attributes' in the
'test_image_create_unknown_attributes' test.

Apologies in advance for the Zuul+Jenkins time this will waste.

Change-Id: I6b26d6efc6353461a36bc742055b906d328f34f1
Removing duplicate entry from base_conf

Removing duplicate enable_v2_api entry.

Change-Id: Id1c531771810310887dbb5a6b8e6f0e4571547bf
fixed typos found by RETF rules in RST files

rules are avaialble at
https://en.wikipedia.org/wiki/Wikipedia:AutoWikiBrowser/Typos

Change-Id: I725d3892d915bf880e62b8b11b97dcfc0a804a41
use /usr/bin/env python instead of /usr/bin/python

The usage of /usr/bin/env ensures that the first interpreter
found in the environment's $PATH variable is used.

Change-Id: I61b27bb9a5fc1f8d2a3981472215bc0aa6a389e2
TaskTest:test_fail() should use asserIstNone

test_fail() in the TasksTest class of tests/unit/test_domain.py uses
assertEqual when testing for None; assertIsNone is more appropriate
here.

This is the kind of thing that would be automatically picked up
by change Ic115342605c472f3a5d255aa570ecb60175ca087

Change-Id: I900334182f056f8b3656339b5bad0b60b334e7dd
Merge "use /usr/bin/env python instead of /usr/bin/python"
Merge "fixed typos found by RETF rules in RST files"
Merge "Removing duplicate entry from base_conf"
Merge "Fixes spelling error in test name"
Merge "TaskTest:test_fail() should use asserIstNone"